Features: High decibel 150dB wire siren alarm with double tone alerts and fire retardant ABS shell ensures powerful security notifications for home and property protections. Features 12VDC operation, flexible wall/balconies mounting option, and compatibility with detectors/gas alarms for integrated security systems. Ideal for homeowners, business operators, and security professionals search reliable perimeter defense against intrusions or emergencies. Installs discreetly in entryways, warehouse, or high risk zones to deter break and alert occupants during fire/safety incidents. small 4.7x7.7x9inchinch design combines durability with 30W output for continuous operation in residential/commercial alarm systems. Specifications: Material: Plastic Size: about 12x19.5x23cm/4.7x7.7x9inch Voltages: dc12v Package Includes: 1xAlarm Horn note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.